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Machine Learning Engineer - Production ML/AI

We're hiring a Machine Learning Engineer to help support and expand a growing production ML environment focused on Comcast's construction operations.

This role is ideal for someone who enjoys more than just building models. You'll be responsible for understanding existing models, improving their accuracy, building data/retraining pipelines, and helping move predictive solutions into production.

The team currently has a production model that predicts how long construction jobs will take and is looking to improve the model while expanding into additional predictive use cases.

The Opportunity

You'll work on several machine learning problems, including:

Construction Duration Prediction
Improve an existing production model that predicts how long construction work will take.

Permit Prediction
Develop a model to predict how long it may take to obtain government permits required for construction.

Cost Prediction
Build a predictive model using historical material and labor expenses to estimate the cost of future construction work.

Automated Construction Design
Explore ML approaches that could help automate aspects of construction design, including trench placement, poles, and cable layouts.

Your ResponsibilitiesAnalyze existing production models and identify opportunities for improvement.Build automated model retraining pipelines.Perform feature engineering and analyze historical data.Investigate model errors and develop solutions for underperforming scenarios.Determine when additional features are appropriate versus when a specialized model may be needed.Develop predictive models using structured and historical data.Build data pipelines supporting model training and feature engineering.Track experiments and model performance.Deploy and integrate ML applications into production environments.Preferred BackgroundMachine Learning Engineering experience.Experience with predictive modeling.Strong Python experience.Experience with XGBoost, LightGBM, or similar ML algorithms.Feature engineering and model evaluation.Experience building ML/data pipelines.Production ML / MLOps experience.AWS experience.MLflow or similar experiment-tracking experience.Strong problem-solving skills and the ability to investigate why models succeed or fail.Environment

AWS | Python | XGBoost | MLflow | DVC | FastAPI | HashiCorp Nomad

This is a great opportunity for someone who wants to work on real predictive AI problems with measurable business impact, rather than purely theoretical ML research.

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MLOps EngineerRole Overview

We are seeking an experienced MLOps Engineer to design, build, and operate the platforms, infrastructure, and processes required to deploy and manage machine learning and AI solutions at scale.

The MLOps Engineer will bridge the gap between data science, AI engineering, software engineering, data engineering, and cloud/platform teams, ensuring that models can be developed, tested, deployed, monitored, and maintained reliably in production.

The ideal candidate will have strong experience across cloud infrastructure, automation, CI/CD, machine learning lifecycle management, model deployment, monitoring, and DevOps practices.

Key ResponsibilitiesDesign and implement scalable MLOps platforms and architectures for machine learning and AI workloads.Build automated pipelines covering the full ML lifecycle, from data and model development through to production deployment and monitoring.Develop and maintain CI/CD and continuous training (CT) pipelines for machine learning models.Automate model testing, validation, deployment, rollback, and lifecycle management.Implement model versioning, experiment tracking, model registries, and reproducible ML workflows.Build and maintain infrastructure for model training, inference, and serving.Deploy machine learning models across cloud, containerised, and Kubernetes-based environments.Implement automated monitoring for model performance, data quality, drift, availability, and operational health.Establish processes for model retraining and continuous improvement.Work closely with data scientists and AI engineers to productionise models and AI applications.Collaborate with data engineers to integrate ML pipelines with enterprise data platforms.Implement infrastructure and environments using Infrastructure as Code (IaC).Develop reusable tooling, frameworks, templates, and deployment patterns for ML teams.Optimise compute, storage, model serving, and cloud infrastructure costs.Implement appropriate security, access control, secrets management, and compliance controls.Support deployment of both traditional machine learning models and Generative AI/LLM applications.Establish observability and operational support processes for production AI/ML systems.Troubleshoot complex infrastructure, deployment, pipeline, model-serving, and performance issues.Define and document MLOps standards, architecture patterns, engineering practices, and operational procedures.Mentor data scientists, AI engineers, and software engineers on production ML practices.Required Skills and ExperienceStrong experience in MLOps, DevOps, machine learning engineering, cloud engineering, or related disciplines.Strong understanding of the end-to-end machine learning lifecycle.Strong programming and scripting skills, particularly Python.Experience building and managing CI/CD pipelines.Experience with containerisation technologies such as Docker.Experience with Kubernetes and container orchestration.Strong experience with at least one major cloud platform such as Azure, AWS, or Google Cloud Platform.Experience with Infrastructure as Code tools such as Terraform.Experience deploying and managing machine learning models in production.Experience with model versioning, experiment tracking, and model registries.Experience with ML platforms and tools such as MLflow, Kubeflow, Azure Machine Learning, AWS SageMaker, or equivalent.Strong understanding of Git, automated testing, deployment automation, and DevOps practices.Experience implementing monitoring, logging, observability, and alerting.Understanding of data pipelines, data quality, model performance, and data/model drift.Strong understanding of cloud security and identity/access management.Excellent troubleshooting and problem-solving skills.Desirable SkillsExperience supporting Generative AI and LLM workloads.Experience deploying RAG applications and vector search infrastructure.Experience with LLM evaluation, monitoring, and observability.Experience with platforms such as Databricks, Snowflake, Azure OpenAI, Amazon Bedrock, or Google Vertex AI.Experience with Apache Spark and distributed data processing.Experience with Kafka or other event-streaming technologies.Experience with GitHub Actions, GitLab CI/CD, Azure DevOps, Jenkins, or equivalent.Experience with Kubernetes tools such as Helm.Experience with cloud-native monitoring technologies.Experience implementing automated model retraining pipelines.Knowledge of responsible AI, AI governance, security, and regulatory requirements.Experience with FinOps and optimisation of cloud-based ML workloads.MLOps Platform Responsibilities

The MLOps Engineer will typically be responsible for establishing and maintaining capabilities across:

Source Control - Git-based development and version management.CI/CD - Automated build, test, validation, and deployment pipelines.Experiment Tracking - Tracking experiments, parameters, metrics, and artefacts.Model Registry - Model versioning, approval, promotion, and lifecycle management.Model Serving - Reliable and scalable online and batch inference.Infrastructure - Automated provisioning of ML environments and compute.Monitoring - Model, application, infrastructure, and data monitoring.Data & Model Drift - Detection and remediation of changes affecting model performance.Security - Identity, access control, secrets, network security, and compliance.Governance - Auditability, lineage, approvals, and model lifecycle controls.Automation - Reducing manual intervention across the ML lifecycle.Key CompetenciesMLOps & ML Lifecycle ManagementCloud EngineeringDevOps & CI/CDPython & AutomationDocker & KubernetesInfrastructure as CodeModel Deployment & ServingMLflow / ML PlatformsMonitoring & ObservabilityModel & Data DriftCloud SecurityGenerative AI & LLM OperationsPerformance & Cost OptimisationTechnical Problem SolvingTypical Experience Level

4-9+ years of experience across MLOps, DevOps, cloud engineering, machine learning engineering, or related disciplines, with demonstrable experience deploying and operating machine learning or AI solutions in production.

A strong candidate should be capable of taking an ML/AI solution from development to production, establishing the automation, infrastructure, monitoring, governance, and operational processes required to run it reliably at scale.

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QA Automation Engineer - AI & Agentic Systems

Level: Senior IC
Location: Remote

Role Summary

We are building agentic AI systems that can interpret complex data sources, documentation, and structured information to perform analysis, validation, and decision-support tasks. This role exists to make those agents trustworthy enough to act on.

This is a senior, hands-on quality role weighted toward testing non-deterministic AI and agentic systems. That is where most of your time sits and where the hiring bar is highest. You will also own the broader quality surface: integration, API, and performance testing are part of the remit, not out of scope.

The differentiator for this role is the ability to define what "good" looks like when a system reasons, calls tools, and can be wrong in subtle ways. You will scope, build, and run the frameworks yourself, with the independence of a senior engineer, and decide what to build first.

Key Responsibilities

Agentic System Testing (Primary Focus)Tool-Use & Trajectory Evaluation: Test whether agents select the right tools for the right reasons and follow sound multi-step trajectories, not just whether the final answer looks plausible. Evaluate planning, intermediate steps, and recovery when a tool fails or returns nothing.Grounding & Citation Verification: Verify that agent claims are backed by cited evidence in source data, documents, or knowledge bases, and that referenced locations actually support the answer, catching confident but unsupported outputs.Honest-Failure & Refusal Calibration: Assert that agents ask for clarification or respond appropriately when information cannot be confidently determined, rather than inventing answers.Guardrail & Adversarial Testing: Probe prompt injection, jailbreaks, and instructions hidden within ingested content, ensuring the agent treats source content as untrusted data.Multi-Turn & State: Validate follow-ups, references to prior turns, and that conversational state carries correctly across a session.

2. AI & LLM ValidationNon-Deterministic Testing: Architect automated frameworks that score generative AI outputs for hallucination, consistency, and factual accuracy against gold-standard datasets using LLM-as-judge methods calibrated against human judgement.Prompt & Model Regression: Design regression suites that catch prompt drift and model-version drift, ensuring changes to models or system instructions do not quietly degrade quality. Own the ground-truth and evaluation datasets these depend on. Live Production QualityContinuous Evaluation: Extend evaluation beyond pre-release into production, continuously scoring live agent outputs so quality is measured on real usage, not only in test environments.Monitoring & Alerting: Build quality monitoring that flags regressions, drift, and anomalous agent behaviour before users discover them.Quality Incident Response: Triage quality incidents and trace failures back to specific model versions, prompts, or datasets, feeding fixes into the development cycle. Integration, API & PerformanceBackend, UI & API Testing: Build robust integration tests that validate API integration across services and key user-facing flows.Secure Gateway Validation: Automate testing of secure API gateways, verifying that Role-Based Access Control (RBAC) and PII-redaction logic work correctly before data reaches AI models.Performance & Load: Own performance test plans and implementation (for example, Locust, JMeter, k6), validating latency, throughput, and stability under realistic load. Data, Traceability & Quality GatesData Validation: Use SQL and data-validation tooling (for example, Great Expectations) to verify data quality across data platforms and vector databases, including the ground-truth and retrieval corpora that agents depend on.Requirements Traceability: Map test and evaluation cases to system requirements and user needs, producing verification-and-validation evidence and quality reports needed to ship with confidence.Quality Gates: Enforce quality gates in GitLab CI/CD that prevent non-compliant models or code from merging and prepare readiness evidence for release reviews.

Technical Requirements

AI Evaluation (Core): Hands-on experience with LLM/agent evaluation frameworks (e.g., DeepEval, TruLens, RAGAS, or custom Python evaluators) and LLM-as-judge techniques.Agent Observability: Experience tracing and debugging agent runs, including tool calls, intermediate steps, token usage, and latency, using tools such as LangSmith, Langfuse, or OpenTelemetry-based tracing.Core Automation: Expert Python for custom test harnesses and evaluation tooling (Pytest), plus standard automation libraries (Selenium/Playwright for UI, Requests for API).Performance Testing: Proven ability to design and implement performance test plans (e.g., Locust, JMeter, k6).Data Validation: Proficiency with SQL and data-validation tools, and familiarity with vector databases and retrieval corpora.CI/CD Integration: Integrating automated tests and evaluations into GitLab CI/CD pipelines and enforcing quality gates.Test Management & Reporting: Managing test reports and artifacts (e.g., TestRail, Allure) and communicating results clearly.Version Control & QE Practices: Maintaining code-based frameworks in Git/GitLab and applying modern quality-engineering practices.Traceability Tools: Familiarity with requirements-management tools (e.g., Jira, Linear, Jama, Polarion) and linking results to requirement IDs.

Professional Qualifications

Experience: 5+ years in QA automation or quality engineering, with at least 2 years focused on testing ML models, LLM applications, or AI agents.Probabilistic Systems Judgement: Able to define pass/fail criteria for systems whose outputs are not identical every run and communicate confidence levels clearly to engineering leadership.Independent Operator: A senior individual contributor who scopes and builds testing and evaluation frameworks with minimal direction and prioritises what matters most.

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Advertising ML Engineer

Remote (USA)

About the Role

We are seeking a talented and motivated Machine Learning Engineer I to join our growing team. This is an exciting opportunity for an early-career professional who is passionate about building machine learning solutions that create meaningful user experiences at scale.

The ideal candidate enjoys solving complex problems, writing production-quality code, and collaborating with cross-functional teams to develop and deploy intelligent systems. You will work closely with data scientists, software engineers, and product teams to build and optimize machine learning models that drive business impact.

Key ResponsibilitiesDevelop, train, and deploy machine learning models for personalization, recommendations, and customer-focused applications.Build scalable data pipelines for feature engineering, model training, evaluation, and inference.Collaborate with data scientists and software engineers to transition research and prototypes into production systems.Improve recommendation and ranking models using large-scale behavioral and engagement data.Monitor and evaluate model performance through experimentation, A/B testing, and data-driven analysis.Write clean, maintainable, and efficient Python code following software engineering best practices.Support initiatives that enhance customer engagement and business outcomes through machine learning solutions.Required QualificationsBachelor's or Master's degree in Computer Science, Machine Learning, Artificial Intelligence, Statistics, Mathematics, Engineering, or a related quantitative field.1-3 years of relevant experience, including internships, research, academic projects, or professional experience.Strong programming skills in Python.Solid understanding of machine learning fundamentals, including:Supervised learningClassification and regressionFeature engineeringModel evaluation and validationExperience with machine learning frameworks such as Scikit-learn, TensorFlow, or PyTorch.Experience working with SQL and large datasets.Familiarity with Git and software development best practices.Strong analytical and problem-solving skills.Why Join Us?Work on machine learning products that impact large-scale user experiences.Collaborate with highly skilled engineers, data scientists, and researchers.Gain hands-on experience deploying production-grade machine learning solutions.Grow your expertise in modern ML technologies and scalable systems.Flexible remote work environment with opportunities for learning and career development.

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Job Description

- Implements, refines, and validates machine learning algorithms for products and applications. - Implements data pipelines consisting of data ingest, data validation, data cleaning, and data monitoring.

- Trains machine learning models, validates the accuracy of the machine learning models once trained, and deploys validated machine learning models into production.

- Assists in development of proof of concept solutions and contributes to studies to support future product or application development.

- Researches, writes, and edits documentation and technical requirements, including evaluation plans, confluence pages, white papers, presentations, test results, technical manuals, formal recommendations, and reports.

- Tests and evaluates solutions. Completes case studies, testing, and reporting.

Skills

- Bachelor's degree in computer science, computer engineering, mathematics, related technical discipline, or related industry experience

- Experience with machine learning, deep learning, data mining, and/or statistical analysis tools and how to deploy and monitor machine learning models.

- Strong programming and software development skills and familiarity with Python, Java or Scala.

- Knowledge of data pipeline and cloud technologies such as Kafka, Spark, and Docker.

- 1-3 years related experience after Bachelors.

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ML Engineer - Recommendations & Personalization

Remote (USA)

About the Role

We are seeking a talented and motivated Machine Learning Engineer I to join our growing team. This is an exciting opportunity for an early-career professional who is passionate about building machine learning solutions that create meaningful user experiences at scale.

The ideal candidate enjoys solving complex problems, writing production-quality code, and collaborating with cross-functional teams to develop and deploy intelligent systems. You will work closely with data scientists, software engineers, and product teams to build and optimize machine learning models that drive business impact.

Key ResponsibilitiesDevelop, train, and deploy machine learning models for personalization, recommendations, and customer-focused applications.Build scalable data pipelines for feature engineering, model training, evaluation, and inference.Collaborate with data scientists and software engineers to transition research and prototypes into production systems.Improve recommendation and ranking models using large-scale behavioral and engagement data.Monitor and evaluate model performance through experimentation, A/B testing, and data-driven analysis.Write clean, maintainable, and efficient Python code following software engineering best practices.Support initiatives that enhance customer engagement and business outcomes through machine learning solutions.Required QualificationsBachelor's or Master's degree in Computer Science, Machine Learning, Artificial Intelligence, Statistics, Mathematics, Engineering, or a related quantitative field.1-3 years of relevant experience, including internships, research, academic projects, or professional experience.Strong programming skills in Python.Solid understanding of machine learning fundamentals, including:Supervised learningClassification and regressionFeature engineeringModel evaluation and validationExperience with machine learning frameworks such as Scikit-learn, TensorFlow, or PyTorch.Experience working with SQL and large datasets.Familiarity with Git and software development best practices.Strong analytical and problem-solving skills.Why Join Us?Work on machine learning products that impact large-scale user experiences.Collaborate with highly skilled engineers, data scientists, and researchers.Gain hands-on experience deploying production-grade machine learning solutions.Grow your expertise in modern ML technologies and scalable systems.Flexible remote work environment with opportunities for learning and career development.

GCS is acting as an Employment Business in relation to this vacancy.

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ML Engineer - Python & Machine Learning

Remote (USA)

About the Role

We are seeking a talented and motivated Machine Learning Engineer I to join our growing team. This is an exciting opportunity for an early-career professional who is passionate about building machine learning solutions that create meaningful user experiences at scale.

The ideal candidate enjoys solving complex problems, writing production-quality code, and collaborating with cross-functional teams to develop and deploy intelligent systems. You will work closely with data scientists, software engineers, and product teams to build and optimize machine learning models that drive business impact.

Key ResponsibilitiesDevelop, train, and deploy machine learning models for personalization, recommendations, and customer-focused applications.Build scalable data pipelines for feature engineering, model training, evaluation, and inference.Collaborate with data scientists and software engineers to transition research and prototypes into production systems.Improve recommendation and ranking models using large-scale behavioral and engagement data.Monitor and evaluate model performance through experimentation, A/B testing, and data-driven analysis.Write clean, maintainable, and efficient Python code following software engineering best practices.Support initiatives that enhance customer engagement and business outcomes through machine learning solutions.Required QualificationsBachelor's or Master's degree in Computer Science, Machine Learning, Artificial Intelligence, Statistics, Mathematics, Engineering, or a related quantitative field.1-3 years of relevant experience, including internships, research, academic projects, or professional experience.Strong programming skills in Python.Solid understanding of machine learning fundamentals, including:Supervised learningClassification and regressionFeature engineeringModel evaluation and validationExperience with machine learning frameworks such as Scikit-learn, TensorFlow, or PyTorch.Experience working with SQL and large datasets.Familiarity with Git and software development best practices.Strong analytical and problem-solving skills.Why Join Us?Work on machine learning products that impact large-scale user experiences.Collaborate with highly skilled engineers, data scientists, and researchers.Gain hands-on experience deploying production-grade machine learning solutions.Grow your expertise in modern ML technologies and scalable systems.Flexible remote work environment with opportunities for learning and career development.

GCS is acting as an Employment Business in relation to this vacancy.

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GCS is acting as an Employment Agency in relation to this vacancy.

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